... Which is essentially what I've been saying since the first page. While the most common answer is 9, it is ambiguous without more parentheses. Occam's Razor is an interesting argument in favour of 9, though, but I'm glad you feel the original problem is underspecified!
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"I found it eventually, at the bottom of a locker in a disused laboratory, with a sign on the door saying "Beware of the Leopard". Ever thought of going into Advertising?"
- Arthur Dent
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